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Home✈️Aircraft🚁HelicopterCentury Radikal G20-30 N640 Hawk Predator › How come my Dampeners dont last long?
07-30-2007 05:46 PM  13 years ago
Spitfire_mk5

rrKey Veteran

Canada

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Did you try gluing them to the headblock?

You can always try running without the shim, dropping shims was one of the next things I was going to try.
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07-30-2007 08:50 PM  13 years ago
Rodney

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St.Cloud,Florida

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Well I agree with the other post. You got somthing bent, head block I would bet. Or your custon cut groove is not in the right spot.
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07-30-2007 09:41 PM  13 years ago
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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yeah...i'm worried about that groove...i have a feeling one of the snap rings are not seated properly....

i already have a stock spindle, but i need the proper thrust bearings to go with it.

i'm going to take the mast off soon and check that out.

i do actually have a small VERY small vibration...only noticable when in normal mode and i'm watching very carefully.
Shawn
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07-30-2007 11:40 PM  13 years ago
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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well, i just finished putting everything back together. the mast is perfectly straight. i could have put in a new one for the sake of it, but i didn't feel the need. i could not detect any signs of the shaft being bent at all.Shawn
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07-31-2007 12:16 AM  13 years ago
Rodney

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St.Cloud,Florida

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Sounds like you have a cut down M/A spindle, they uuse larger thrust bearings since the end is not stepped down.
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07-31-2007 12:35 AM  13 years ago
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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no, its a home made spindle. from the previous owner.Shawn
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07-31-2007 01:21 AM  13 years ago
bigdad390

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East. Liverpool, Ohio

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I'm still using the stock dampers that came with both of my Hawk Pros. I just occasionally put a drop or two of 3in1 oil between the head yoke and the blade grips to lubricate the dampers. On the second Hawk, I dissassebled the head and used Vasoline on the dampers. I have run 4 gallons of fuel throught the first Hawk and a couple through the second one.
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07-31-2007 06:04 AM  13 years ago
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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well....i think i MAY have figured out what the problem is.

i think the shims outside diameter is too small. the shims have a smaller diameter then the dampeners, so when the head moves, the shims dig into the dampener, and give the damage i'm getting. i just took a close look, and there are pieces of the dampener comeing out.

i found a single shim i could use with a larger diameter, but i cant find a second, lol.
Shawn
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07-31-2007 12:55 PM  13 years ago
jester4

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Brampton, Ontario

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That sounds like a good possibillity, I bet that's the cause right there.
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07-31-2007 09:16 PM  13 years ago
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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hmm..i think that may be it. i was just looking in the manual, and the part number HW6182 shows a few small diameter shims, along with a couple larger ones...i only have the smaller ones.

i just put in an order to get a new shim set so i can get the larger ones.
Shawn
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08-01-2007 01:56 AM  13 years ago
AceBird

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Utica, NY USA

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That's definitely it. The large one covers the full compression of the o-ring while the small one bears on the inner race of the ball bearing. The inner race isn't moving, the outer race is and that will chew up the rubber.Ace
What could be more fun?
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08-01-2007 02:34 AM  13 years ago
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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ah, sweet, thanks. i cant seem to find them laying aroudn anywhere actually....but they are ordered, hopefully have them within a couple weeksShawn
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08-12-2007 09:56 AM  13 years ago
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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well, i got the larger diameter shims installed, thanks to Steve for finding them for me

the head is noticably stiffer. i have only 3 flights on it at the moment. i ended up putting new dampeners in because the ones that were only a gallon old were already torn up and split. i'll throw some more fuel in it this week now that i know (hopefully) that i wont have to change the dampeners again so soon

i think i'm a pro at disassembling that head now
Shawn
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Home✈️Aircraft🚁HelicopterCentury Radikal G20-30 N640 Hawk Predator › How come my Dampeners dont last long?
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